The internet provider XS4ALL (in dutch) gives it's customers 2 VoIP lines free of charge, with the option to be able to make outbound calls to phone numbers worldwide.

Before you start you need to have activated your XS4All VoIP number. As you will need the account details further on, replace <08787.....> with your own phone number and <password> with the password for that number.

4. Click You have made changes - when finished, click here to APPLY them (in the red bar near the top of the page) after which you should be able to make and receive calls using your XS4ALL VoIP number.